Concrete block



FIG. 1 is a top, front and side perspective view of a concrete block showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a front side elevational view thereof;

FIG. 7 is a back side elevational view thereof;

FIG. 8 is a top, front and side perspective view of a second embodiment of a concrete block showing our new design;

FIG. 9 is a top plan view of FIG. 8;

FIG. 10 is a bottom plan view of FIG. 8;

FIG. 11 is a left side elevational view of FIG. 8;

FIG. 12 is a right side elevational view of FIG. 8;

FIG. 13 is a front side elevational view of FIG. 8; and,

FIG. 14 is a rear side elevational view of FIG. 8. 

The ornamental design for a concrete block, as shown and described. 